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TypedArray.prototype.indexOf()

The indexOf() method of TypedArray instances returns the first index at which a given element can be found in the typed array, or -1 if it is not present. This method has the same algorithm as Array.prototype.indexOf().

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Syntax

js
indexOf(searchElement)
indexOf(searchElement, fromIndex)

Parameters

searchElement

Element to locate in the typed array.

fromIndex Optional

Zero-based index at which to start searching, converted to an integer.

Return value

The first index of searchElement in the typed array; -1 if not found.

Description

See Array.prototype.indexOf() for more details. This method is not generic and can only be called on typed array instances.

Examples

Using indexOf()

js
const uint8 = new Uint8Array([2, 5, 9]);
uint8.indexOf(2); // 0
uint8.indexOf(7); // -1
uint8.indexOf(9, 2); // 2
uint8.indexOf(2, -1); // -1
uint8.indexOf(2, -3); // 0

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android Deno Node.js
indexOf 45 12
37Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.
32 9.1 45
37Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.
32 9.3 5.0 45 1.0 4.0.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/indexOf